Colossal Magnetoresistance in the Transition-Metal Zintl Compound Eu₁₄MnSb₁₁

Abstract

Magnetoresistance measurements have been carried out on single-crystal sample of the transition-metal Zintl compound Eu 14 MnSb 11 . Eu 14 MnSb 11 is the first compound of the Ca 14 -AlSb 11 structure type in which magnetoresistive effects have been measured. Colossal magnetoresistance (CMR) at 92 K and 5 T with ∆F/F(0) ) -36% and at 5 K and 5 T with ∆F/F(0) ) -42% were observed. CMR is observed at the ferromagnetic-paramagnetic phase transition (92 K). A large negative magnetoresistance is observed below the second magnetic transition (15 K) and is attributed to a field-induced antiferromagnetic-ferromagnetic ordering of the Eu 2+ lattice. The MR is highly anisotropic with respect to the crystallographic axes. A sign change in the curvatures of F(H) curves below and above 92 K has been observed, indicating that two different mechanisms are responsible for the magnetic scattering of the carriers in two separate temperature regions.

Magnetism and Negative Magnetoresistance of Two Magnetically Ordering, Rare-Earth-Containing Zintl phases with a New Structure Type: EuGa2Pn2 (Pn = P, As)

“…Magnetoresistance (MR) has been observed in several rare-earth Zintl analogues. 6,[8][9][10][14][15][16][17] It is thought that the MR behavior of rare-earth-containing Zintl phases originates from interactions between the localized magnetic moment on the rare-earth cations and the delocalized conduction electrons of the Zintl polyanions. Such materials could be useful in magnetic storage applications.…”

Crystal growth, characterization and physical properties of PrNiSb3, NdNiSb3 and SmNiSb3

“…The Zintl phase Eu 14 MnSb 11 , exhibits colossal magnetoresistance (up to À36%) and shows a ferromagnetic transition at 92 K [2]. Recently, the first Pr-based heavy-fermion compound, PrOs 4 Sb 12 , was found to be superconducting below T C ¼ 1:85 K [3].…”

Role of the dimensionality of the [GaX]2 network in the Zintl phases EuGa2X2

“…The optical spectra originate mainly from the transitions between occupied Eu 4f states and unoccupied Eu 5d states. It is demonstrated that the two-dimensional ½GaðP=AsÞ 2 network in EuGa 2 P 2 and EuGa 2 As 2 is favorable for thermoelectric applications as compared to the three-dimensional ½GaSb 2 Zintl phases have received great interest because of their fascinating structural variety and applications. Their physical properties include complex magnetic ordering and superconductivity.…”

“…Their physical properties include complex magnetic ordering and superconductivity. 1,2 Recently, Zintl phases have also been recognized as a new material class for thermoelectric applications. 3 Rare earth analogues of alkali or alkaline earth Zintl phases achieve the same complexity and variety as their main group counterparts but also show colossal magnetoresistance (CMR).…”

“…3 Rare earth analogues of alkali or alkaline earth Zintl phases achieve the same complexity and variety as their main group counterparts but also show colossal magnetoresistance (CMR). 2 This behavior of rare earth Zintl compounds originates from interactions between the localized magnetic moments on the rare earth cations and the delocalized conduction electrons of the Zintl polyanions.…”